Why do viruses cause cancer? a Viruses and cancer cells have similar needs: Proliferation control Cell death control Modulation of immune response Induction of vascularization Metastasis(tumor) cell migration(viruses) Viruses and cancer cells have similar needs: • Proliferation control • Cell death control • Modulation of immune response • Induction of vascularization • Metastasis (tumor)/ cell migration (viruses) Why do viruses cause cancer?